One day he arrives home looking very downcast. “That’s it,” he tells his wife. “I’m giving up golf. My eyesight has gotten so bad that once I’ve hit the ball, I can’t see where it lands!”

His wife sympathizes. As they sit down for dinner she makes a suggestion: “Why don’t you take my brother with you and give it one more try.” “That’s no good, ” sighs Bob, “your brother is a 103 years old!” “He may be 103,” says the wife, “but his eyesight is perfect.”

So the next day, Bob heads off to the golf course with his brother-in-law. He tees up, takes an almighty swing and squints down the fairway. He turns to his brother-in-law. “Did you see the ball?” “Of course I did! I have perfect eyesight,” says the brother-in-law.